A day after the bodies were located, Charles Martinez, 24, turned himself in to the sheriff’s office. He hasn’t been charged in the double homicide, but remains a person of interest, the sheriff’s office said. Martinez was arrested on Oct. 11 on outstanding warrants and is being held in the Hillsborough County jail on outstanding warrants. His bail is $50,000, according to jail records.

Greene, Kalb and Martinez were friends. The extent of their relationship isn’t known, the sheriff’s office said. Martinez, who also lived in Brandon, stayed at Greene’s apartment from time to time, the sheriff’s office said.

He’s a person of interest in the case because it is believed he saw the two women before the homicide took place, said Larry McKinnon, a sheriff’s office spokesman.

“As far as we know we believe that he was the last person to have contact with them prior to their death,” McKinnon said.

The deaths were ruled homicidal violence and the fire was set to cover up and damage any evidence at the crime scene, McKinnon said.

On Oct. 10, Greene’s family contacted the sheriff’s office to report her missing. Greene hadn’t picked up her son from day care on Oct. 9. Deputies went to Greene’s apartment and saw that a fire had been set and two dead bodies were inside.

No one has been charged in the double homicide and the case remains under investigation.